Burglar-proof bar for window-gratings.



' No. 679,028. Patented July 23, l90l.

w. H. LABMORE. BURGLAB PROOF BAR FOR WINDOW GRATINGS.

(No Model.)

m mm w w\ 1T m .w Mfi.

N NW N UNITED STATE PATENT FFICE.

VALTER H. LARMORE, OF ANDERSON, INDIANA.

BURGLAR-PROOF BAR FOR WINDOW-GRATINGS.

SPECIFICATION forming part of Letters Patent No. 679,028, dated July 23,1901.

Application filed December 28,1900. Serial No. 41,390. (No model.)

To all whom it may concern:

Be it known that I, WALTER H. LARMORE, a citizen of the United States,and a resident of Anderson, in the county of Madison and State ofIndiana, have made a certain new and useful Invention in Burglar-ProofBars for \Vindow-Gratings, &c.; and I declare the following to be afull, clear, and exact description of the invention,such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersof reference marked thereon, which form a part of this specification.

Figure 1 is a front elevation of my invention as applied, parts beingbroken away.

Fig. 2 is a longitudinal central section of one of my bars. Fig. 3 is adetail view of the end of one of the core stems or rods G. Fig. 4 is adetail view of one of the sections F.

The invention relates to gratings for windows, doors, and other placesneeding such protection; and it consists in the novel construction andcombinations of parts, as hereinafter set forth.

In the accompanying drawings, illustrating the invention, the letter Adesignates a window which is designed to be provided with a grating,(represented at B.) a

O C are the cross-bars, which are of ordinary character, secured in thewalls of the window.

D D indicate the vertical bars, which are placed close enough togetherto afiord proper protection. Each bar consists of a tubular or hollowcasing E, of iron or other metal, having at its lower end a separablesection F, which forms the foot of the bar, a hardsteel rod or core-stemG, inclosed in said tubular casing, and ball-bearings H for the end orends of the steel rod. tion shown the foot-section F of the tubular orhollow casing or outer portion of the grating-bar is threaded to connectwith the threaded end of said tubular casing, as indicated at k. In thesection F is provided a ballbearing seat Z, having theantifriction-balls m, on which the pivotal end of the interior steel rodrests, said end being suitably beveled or rounded to properly engage theballbearings. The upper end of the bar may be In the construcsimilarlyformed, having a separable section F and a ball-bearing seat therein toengage the upper end of the interior steel stem or core-rod.

When used to form a grating, as indicated, these bars do not differ inappliance from ordinary grating-bars; but they nevertheless afford muchgreater security, as on account of the ball-bearings it is impracticableto file through the interior steel rods or cores which extend from endto end of the window.

These grating-bars are especially adapted to use in the windows anddoors of prisons and banks, as Well as of private residences, as

even when exposed to the weather, as such gratings usually are, there isno danger of the core rods or stems becoming attached to theball-bearings of their end seats by oxidation or otherwise.

Having described this invention, what I claim, and desire to secure byLetters Patent, 1s

1. The combination with a pivotal gratingbar, of a ball-bearing endseat, substantially as specified.

2. A grating-bar, consisting of a metallic casing, having a foot-sectionprovided with a balLbearing seat, and a pivotal steel core-rod withinsaid casing, having its end engaging said ball-bearing seat,substantially as specified.

3. A grating-bar, consisting of a metallic casing or tube having endsections provided with ball-bearing seats, and an interior pivotal steelcore-rod extending from end to end of the window, provided with beveledor rounded ends to engage the ball-bearings,substantially as specified.

4. A grating-bar, consisting of a metallic casing, or tube havingseparable end sections provided with ball-bearing end seats, and aninterior pivotal steel core-rod, having ends engaging the ball-bearingsof said end seats, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

WALTER I-I. LARMORE.

